[R] labels and counting
Dax42 at web.de
Thu Dec 30 20:01:01 CET 2004
I have got the following problem:
given is a large string sequence consisting of the four letters "A" "C"
"G" and "T" (as before). Additionally, I have got a second string
sequence of the same length giving a label for each character. The
labels are "+" and "-".
Now I would like to create an 8x8 matrix which contains the numbers on
how often we see all possible pairwise combinations, for example "A"
with the label "+" followed by "C" with the label "+" or "T"->"C" with
the labels "-"->"+" etc.
Of course I can just use loops to "walk" along the sequence, but as you
have shown me so much better solutions in response to my last mail, I
thought you might be able to help and improve my R skills even further
Thanks for your ideas!
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